Configuring Postfix Plesk Mail Driver...
Trying to comment out comsat service record from /etc/xinetd.conf... there is no comsat service record in /etc/xinetd.conf
Fatal error: plesk::mail::postfix::PostfixConfigurationError(postmap: fatal: parameter inet_interfaces: no local interface found for ::1

There is a big amount of OACI virtual environments with IPv6 addresses assigned to them. The corresponding harware node with the faulty VE hosted on it contains the following errors in dmesg in large amount:

[2781621.011489] Neighbour table overflow.

Cause

::1 address is not configured inside the VE on the loopback adapter, due to insufficient amount of IPv6 neigh cache storage on the hardware node.